THREE-DIMENSIONAL DISPLACEMENT MEASUREMENT METHOD

PROBLEM TO BE SOLVED: To provide a method of measuring displacements of many measurement points, simply and in a labor-saving manner, by acquiring three-dimensional point group data by measurement before and after the displacements. SOLUTION: The measurement is performed before and after the displacement which comprises a first step of acquiring the three-dimensional point group data, a second step of defining a displacement measurement surface 3 as a measured object and defining a three-dimensional measurement reference coordinate system A' on the displacement measurement surface 3, a third step of defining a directional vector ν, whose displacement is intended to be measured, setting a three-dimensional displacement measurement coordinate system A" so that Z' axis of the three-dimensional measurement reference coordinate system A' matches with the directional vector, and converting the three-dimensional point group data into the three-dimensional displacement measurement coordinate system A"; and a fourth step of setting a mesh on the X"-Y" plane in the three-dimensional displacement measurement reference coordinate system A" and calculating the average value of the Z" coordinates interspersed in section by each mesh. The difference between the Z" coordinate average values before and after the displacement is set as the displacement amount. COPYRIGHT: (C)2007,JPO&INPIT